CA1314280C - Liquid organopolysiloxane compositions - Google Patents
Liquid organopolysiloxane compositionsInfo
- Publication number
- CA1314280C CA1314280C CA000563888A CA563888A CA1314280C CA 1314280 C CA1314280 C CA 1314280C CA 000563888 A CA000563888 A CA 000563888A CA 563888 A CA563888 A CA 563888A CA 1314280 C CA1314280 C CA 1314280C
- Authority
- CA
- Canada
- Prior art keywords
- weight
- groups
- organosiloxane
- parts
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0091—Complexes with metal-heteroatom-bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
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- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/50—Lubricating compositions characterised by the base-material being a macromolecular compound containing silicon
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- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/26—Carboxylic acids; Salts thereof
- C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M129/30—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 7 or less carbon atoms
- C10M129/32—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 7 or less carbon atoms monocarboxylic
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- C10M129/40—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
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- C10M155/02—Monomer containing silicon
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- C10M169/04—Mixtures of base-materials and additives
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/42—Block-or graft-polymers containing polysiloxane sequences
- C08G77/44—Block-or graft-polymers containing polysiloxane sequences containing only polysiloxane sequences
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/70—Siloxanes defined by use of the MDTQ nomenclature
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- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
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Abstract
Abstract of the Disclosure An organopolysiloxane composition comprising (1) a polydi-organosiloxane, (2) an organosiloxane having at least one silicon-bonded group selected from anilinophenoxy and naphthyl-aminophenoxy groups and (3) a siloxy metal compound wherein the metal is Ti, Zr or Hf, or a zirconium salt of a monocarboxylic acid.
The compositions are stabilised against high temperature oxidative degeneration and are useful inter alia as viscous coupling fluids for automobile fan clutches.
The compositions are stabilised against high temperature oxidative degeneration and are useful inter alia as viscous coupling fluids for automobile fan clutches.
Description
`- 1 31~280 --LIQUID ORGANOPOLYSILOXANE COMPOSI~IONS
This invention relates to liquid organosiloxane compositions and is particularly concerned with such compo-sitions which exhibit reduced variation of viscosity with time and temperature.
The use of liquid organosiloxanes as lubricants, heat transfer fluids and viscous coupling fluids is known. In order to function satisfactorily in the latter application the fluid should possess certain properties, in particular stability against oxidation and little or no variation of viscosity throughout the range of op~rating temperatures and during its intended operating life. Most commonly employed in such applications are the liquid polydimethyl-siloxanes. However, if employed alone at high operating temperatures the polydimethylsiloxanes can exhibit an increase in viscosity and subsequent gelation. Such increase in viscosity can be delayed by the addition of certain antioxidants. For example in U.S. Patent No.
3 328 350 it is disclosed that the addition of e.g. the reaction product of an organosiloxane and p-anilinophenol to fluid polydimethylsiloxanes can improve their stability against oxidative degradation. U.S. Patent No. 4 537 691 discloses a novel silicone ~luid composition usable as a working fluid at high temperatures which comprises a mixture of a diorganopolysiloxane having both trihydro-carbylsiloxy groups and hydroxy groups with siloxaneshaving certain aminoaryl, e.g. anilinophenoxy, substituents.
European Patent Application 0 191 456 (Toray Silicone Company), published August 20, 198~describes a further development in the art and is concerned with organopolysiloxane viscous coupler fluids comprising a q~
1~
mixture of an organopolysiloxane fluid, a zirconium-containing organosiloxane compound and a cerium-containing organosiloxane compound.
Although the known prior art fluids perform satisfac-torily as fan clutch liquids under normal operatingconditions the advent of higher performance automotive engines has demanded liquids having even greater resistance to oxidative degradation and viscosity change.
According to the present invention there is provided an organopolysiloxane composition comprising (1) 100 parts by weight of a liquid polydiorganosiloxane wherein at least 70 percent of the total organic substituents are methyl groups, any remaining organic substituents being selected from alkyl groups having from 2 to 14 inclusive carbon atoms and phenyl groups, (2) from 0.01 to 7.5 parts by weight of an organosiloxane having at least one silicon-bonded group selected from anilinophenoxy and naphthyl-aminophenoxy groups and (3) a metal compound which is sele^ted from (i) siloxy metal compounds having in the molecule at least one metal atom selected from titanium, zirconium and hafnium atoms attached to silicon via a TiOSi, ZrOSi or HfOSi linkage, and (ii) zirconium salts of monocarboxylic acids, there being sufficient of the metal compound present to provide from 0.001 to 0.25 part by weight of metal.
The polydiorganosiloxanes (l) of the compositions of this invention may be represented by the average unit general formula RnSiO4_n, wherein R represents the organo substituents attached to silicon and _ has a value of from about 1.~5 to about 2.15, preferably from 1.99 to 2.01.
The polydiorganosiloxanes are thus predominantly linear in character but may contain relatively small proportions of - 131~280~
chain branching (RSiO3/2) units. End-blocking units R3SiO~
are preferably present but polydiorganosiloxanes in which such units are absent are also operative. Thus the polydiorganosiloxane may be terminated with for example _SiOH or _SiOR groups.
At least 70 percent of the total R groups are methyl groups. Any remaining R groups may be, for example, ethyl, butyl, trimethylpentyl, dodecyl or phenyl. Examples of polydiorganosiloxanes (l) therefore are trimethylsilyl end-blocked polydimethylsiloxanes, dimethylphenylsilyl end-blocked polydimethylsiloxanes, trimethylsilyl end-stopped copolymers of dimethylsiloxane and phenylmethylsiloxane units and hydroxyl-terminated polydimethylsiloxanes. Poly-diorganosiloxane (1) may consist of a single siloxane polymer or a mixture of siloxane polymers having different substituents, structures or viscosities. Preferred for use according to this invention are polydiorganosiloxanes which consist of a mixture of from about 70 to 95 parts by weight of a polydimethylsiloxane and from 5 to 30 parts by weight of a polymethylphenylsiloxane or a copolymer of dimethyl-siloxane and methylphenylsiloxane.
The viscosity of polydiorganosiloxane (1) can vary within wide limits e.g. from 0.0005 to 0.1 m2/s at 25C
provided it is liquid at 25C. Generally the particular viscosity wi:Ll be chosen having regard to the requirements of the intended application. When required for use in viscous coupling, such as in automobile fan clutches, a viscosity in the range from 0.001 to 0.05 m2/s is preferred.
Component (2) of the compositions of this invention is an organosiloxane having at least one silicon-bonded group selected from anilinophenoxy and naphthylaminophenoxy groups. The remaining substituents attached to silicon are selected from alkyl groups e.g. methyl, ethyi, isopropyl and phenyl groups, organosiloxanes wherein the remaining substituents are substantially all methyl groups being preferred. The organosiloxane (2) is also preferably a substantially linear polydiorganosiloxane.
At least one C6H5NHC6H4O- and/or C10 6 6 4 should be present in (2). Such groups may be pendant from silicon atoms along the siloxane chain, attached to a terminal silicon atom or both. Organosiloxanes (2) may be homopolymers or copolymers. They are known substances and can be prepared by the reaction of acyloxy siloxanes and the appropriate phenol, e.g. p-anilinophenol, as described in U.S. Patent 3 328 350. Another method of preparing such organosiloxanes comprises reacting the phenol with an organosiloxane having silicon-bonded chlorine atoms in the presence of an acceptor for the by-product HCl. The proportion of (2) employed in the compositions of this invention will depend largely upon the magnitude of the desired effect and the proportion of the specified amino phenoxy substituents in the molecule relative to the remaining substituents. At least 0.01 and up to 7.5 parts per 100 parts of (1) can be employed, from 0.1 to 2.5 parts generally being preferred.
Component (3) of the compositions of this invention is (i) a siloxy metal compound in which the metal is Zr, Ti or Hf and in which the metal atom is joined to a silicon through an oxygen atom? or (ii) a zirconium salt of a mono-carboxylic acid or both (i) and (ii).
The siloxy metal compounds (i) are organosilicon compounds, e.g. organosilanes and organosiloxanes, having at least one ZrOSi, TiOSi HfOSi bond per molecule. The remaining valencies of the silicon atoms may be satisfied by other metal-oxygen linkages, by monovalent hydrocarbon ;~ 131~280 groups, for example methyl, ethyl, propyl, octyl, vinyl, phenyl or benzyl, or by divalent oxygen atoms linked in turn to other silicon atoms to form siloxane -SiOSi-linkages. Any valencies of the Zr, Ti or ~f atoms which are not satisfied by siloxy groups are satisfied by oxygen-bonded organic groups for example alkoxy groups e.g.
methoxy, ethoxy, butoxy and decoxy, aryloxy e.g. phenoxy, acyloxy groups e.g. acetoxy, propionoxy and octanoxy, and chelating groups such as ethylacetoacetate and acetylace-tonate. Thus one type of siloxy metal compound (i) is thatwhich may be exemplified by the general formula - ~(CH3)2SiOJxM-in which M represents Zr, Ti or Hf, and ~he remaining valencies of M are satisfied by other siloxy e.g.
-(C~l3)2SiO- groups, or by oxygen linked organic groups as specified above. Another type of siloxy metal compound may be exemplified by the compound [(CH3)3SiO~4M.
The metal siloxy compounds are ~nown substances and can be prepared, for example, by heatîng a mixture of a polydimethylsiloxane and an organometal compound having metal-oxygen-carbon linkages. Alternatively they can be prepared by reacting the metal alkoxide with a silanol-terminated organosiloxane or by reacting the metal halide with an alkali metal silanolate.
It is generally preferred to use as Component (3) of the compositions of this invention the siloxy metal compounds (i), particularly organosiloxanes wherein at least 80 percent of the total silicon-bonded organic groups are methyl. Such organosiloxanes are more soluble in the polydiorganosiloxane (1), and thus more readily dispersed therein. However, the zirconium carboxylates, for example zirconium acetate, zirconium butyrate and zirconium octoate may also be employed in place of, or in combination with, the siloxy metal compound.
131428~
Sufficient of Component (3) should be present to provide from 0.001 to 0.25 parts, preferably 0.005 to 0.1 part by weight of metal per 100 parts by weight of the polydiorganosiloxane (1).
The compositions of this invention can be prepared by simply mixing Components (1), (2) and (3) in any order.
Usually, however, the most convenient method is to add (2) and (3) to (1).
The compositions comprising (1), (2) and (3) are resistant to degradation under conditions of high shear at elevated temperatures. They are thus particularly useful as viscous coupling fluids, for example in automobile fan clutches, where retention of a stable working viscosity over prolonged periods is required.
1~ The following Example in which all parts are expressed by weight illustrates the invention.
To 89 parts of a trimethylsilyl-end stopped polydi-methylsiloxane having a viscosity of 9 x 10 3 m2/s (9OOOcS) at 25C were added 9.9 parts of a trimethylsilyl-end stopped copolymer of 90% dimethylsiloxane units and 10%
methylphenylsiloxane units having a viscosity of 10 4 m2/s (lOOcS) at 25C. To this mixture was then added, with stirring, 0.5 part of a polydimethylsiloxane having a p-anilinophenoxy group attached to each of its terminal silicon atoms and a molecular weight of approximately 2,000, followed by 0.6 part of zirconium-containing methyl-siloxane containing 3% by weight of zirconium and obtained by heating together a polydimethylsiloxane and zirconium octoate. Stirring was continued until the mixture became homogeneous.
The mixture obtained above exhibited stability of its working viscosity over a long period when employed as a viscous coupling fluid in the fan clutch of a high perfor-mance automobile engine.
~31428~ ~
-Four organosiloxane mixtures A, B, C and D were prepared as described hereinabove containing respectively 0, 0.6, l.0 and 2.0 parts of the zirconium-containing methylsiloxane. Each mixture was then subjected to hermogravimetric analysis employing a Perkin Elmer TCS-2 Thermogravimetric Analyser the temperature being increased at a rate of 30C per minute. For Sample A the onset of rapid weight loss (indicating polymer degradation) commenced at 492~C, total loss of weight of the sample occurring at about 650C. In the cases of Samples, B, C
and D the onset of rapid weight loss did not occur until the temperature had reached approximately 600C and total disappearance of the samples (100% loss of weight) occurred at temperatures from about 700 to 750C.
* Trademark .. ..
This invention relates to liquid organosiloxane compositions and is particularly concerned with such compo-sitions which exhibit reduced variation of viscosity with time and temperature.
The use of liquid organosiloxanes as lubricants, heat transfer fluids and viscous coupling fluids is known. In order to function satisfactorily in the latter application the fluid should possess certain properties, in particular stability against oxidation and little or no variation of viscosity throughout the range of op~rating temperatures and during its intended operating life. Most commonly employed in such applications are the liquid polydimethyl-siloxanes. However, if employed alone at high operating temperatures the polydimethylsiloxanes can exhibit an increase in viscosity and subsequent gelation. Such increase in viscosity can be delayed by the addition of certain antioxidants. For example in U.S. Patent No.
3 328 350 it is disclosed that the addition of e.g. the reaction product of an organosiloxane and p-anilinophenol to fluid polydimethylsiloxanes can improve their stability against oxidative degradation. U.S. Patent No. 4 537 691 discloses a novel silicone ~luid composition usable as a working fluid at high temperatures which comprises a mixture of a diorganopolysiloxane having both trihydro-carbylsiloxy groups and hydroxy groups with siloxaneshaving certain aminoaryl, e.g. anilinophenoxy, substituents.
European Patent Application 0 191 456 (Toray Silicone Company), published August 20, 198~describes a further development in the art and is concerned with organopolysiloxane viscous coupler fluids comprising a q~
1~
mixture of an organopolysiloxane fluid, a zirconium-containing organosiloxane compound and a cerium-containing organosiloxane compound.
Although the known prior art fluids perform satisfac-torily as fan clutch liquids under normal operatingconditions the advent of higher performance automotive engines has demanded liquids having even greater resistance to oxidative degradation and viscosity change.
According to the present invention there is provided an organopolysiloxane composition comprising (1) 100 parts by weight of a liquid polydiorganosiloxane wherein at least 70 percent of the total organic substituents are methyl groups, any remaining organic substituents being selected from alkyl groups having from 2 to 14 inclusive carbon atoms and phenyl groups, (2) from 0.01 to 7.5 parts by weight of an organosiloxane having at least one silicon-bonded group selected from anilinophenoxy and naphthyl-aminophenoxy groups and (3) a metal compound which is sele^ted from (i) siloxy metal compounds having in the molecule at least one metal atom selected from titanium, zirconium and hafnium atoms attached to silicon via a TiOSi, ZrOSi or HfOSi linkage, and (ii) zirconium salts of monocarboxylic acids, there being sufficient of the metal compound present to provide from 0.001 to 0.25 part by weight of metal.
The polydiorganosiloxanes (l) of the compositions of this invention may be represented by the average unit general formula RnSiO4_n, wherein R represents the organo substituents attached to silicon and _ has a value of from about 1.~5 to about 2.15, preferably from 1.99 to 2.01.
The polydiorganosiloxanes are thus predominantly linear in character but may contain relatively small proportions of - 131~280~
chain branching (RSiO3/2) units. End-blocking units R3SiO~
are preferably present but polydiorganosiloxanes in which such units are absent are also operative. Thus the polydiorganosiloxane may be terminated with for example _SiOH or _SiOR groups.
At least 70 percent of the total R groups are methyl groups. Any remaining R groups may be, for example, ethyl, butyl, trimethylpentyl, dodecyl or phenyl. Examples of polydiorganosiloxanes (l) therefore are trimethylsilyl end-blocked polydimethylsiloxanes, dimethylphenylsilyl end-blocked polydimethylsiloxanes, trimethylsilyl end-stopped copolymers of dimethylsiloxane and phenylmethylsiloxane units and hydroxyl-terminated polydimethylsiloxanes. Poly-diorganosiloxane (1) may consist of a single siloxane polymer or a mixture of siloxane polymers having different substituents, structures or viscosities. Preferred for use according to this invention are polydiorganosiloxanes which consist of a mixture of from about 70 to 95 parts by weight of a polydimethylsiloxane and from 5 to 30 parts by weight of a polymethylphenylsiloxane or a copolymer of dimethyl-siloxane and methylphenylsiloxane.
The viscosity of polydiorganosiloxane (1) can vary within wide limits e.g. from 0.0005 to 0.1 m2/s at 25C
provided it is liquid at 25C. Generally the particular viscosity wi:Ll be chosen having regard to the requirements of the intended application. When required for use in viscous coupling, such as in automobile fan clutches, a viscosity in the range from 0.001 to 0.05 m2/s is preferred.
Component (2) of the compositions of this invention is an organosiloxane having at least one silicon-bonded group selected from anilinophenoxy and naphthylaminophenoxy groups. The remaining substituents attached to silicon are selected from alkyl groups e.g. methyl, ethyi, isopropyl and phenyl groups, organosiloxanes wherein the remaining substituents are substantially all methyl groups being preferred. The organosiloxane (2) is also preferably a substantially linear polydiorganosiloxane.
At least one C6H5NHC6H4O- and/or C10 6 6 4 should be present in (2). Such groups may be pendant from silicon atoms along the siloxane chain, attached to a terminal silicon atom or both. Organosiloxanes (2) may be homopolymers or copolymers. They are known substances and can be prepared by the reaction of acyloxy siloxanes and the appropriate phenol, e.g. p-anilinophenol, as described in U.S. Patent 3 328 350. Another method of preparing such organosiloxanes comprises reacting the phenol with an organosiloxane having silicon-bonded chlorine atoms in the presence of an acceptor for the by-product HCl. The proportion of (2) employed in the compositions of this invention will depend largely upon the magnitude of the desired effect and the proportion of the specified amino phenoxy substituents in the molecule relative to the remaining substituents. At least 0.01 and up to 7.5 parts per 100 parts of (1) can be employed, from 0.1 to 2.5 parts generally being preferred.
Component (3) of the compositions of this invention is (i) a siloxy metal compound in which the metal is Zr, Ti or Hf and in which the metal atom is joined to a silicon through an oxygen atom? or (ii) a zirconium salt of a mono-carboxylic acid or both (i) and (ii).
The siloxy metal compounds (i) are organosilicon compounds, e.g. organosilanes and organosiloxanes, having at least one ZrOSi, TiOSi HfOSi bond per molecule. The remaining valencies of the silicon atoms may be satisfied by other metal-oxygen linkages, by monovalent hydrocarbon ;~ 131~280 groups, for example methyl, ethyl, propyl, octyl, vinyl, phenyl or benzyl, or by divalent oxygen atoms linked in turn to other silicon atoms to form siloxane -SiOSi-linkages. Any valencies of the Zr, Ti or ~f atoms which are not satisfied by siloxy groups are satisfied by oxygen-bonded organic groups for example alkoxy groups e.g.
methoxy, ethoxy, butoxy and decoxy, aryloxy e.g. phenoxy, acyloxy groups e.g. acetoxy, propionoxy and octanoxy, and chelating groups such as ethylacetoacetate and acetylace-tonate. Thus one type of siloxy metal compound (i) is thatwhich may be exemplified by the general formula - ~(CH3)2SiOJxM-in which M represents Zr, Ti or Hf, and ~he remaining valencies of M are satisfied by other siloxy e.g.
-(C~l3)2SiO- groups, or by oxygen linked organic groups as specified above. Another type of siloxy metal compound may be exemplified by the compound [(CH3)3SiO~4M.
The metal siloxy compounds are ~nown substances and can be prepared, for example, by heatîng a mixture of a polydimethylsiloxane and an organometal compound having metal-oxygen-carbon linkages. Alternatively they can be prepared by reacting the metal alkoxide with a silanol-terminated organosiloxane or by reacting the metal halide with an alkali metal silanolate.
It is generally preferred to use as Component (3) of the compositions of this invention the siloxy metal compounds (i), particularly organosiloxanes wherein at least 80 percent of the total silicon-bonded organic groups are methyl. Such organosiloxanes are more soluble in the polydiorganosiloxane (1), and thus more readily dispersed therein. However, the zirconium carboxylates, for example zirconium acetate, zirconium butyrate and zirconium octoate may also be employed in place of, or in combination with, the siloxy metal compound.
131428~
Sufficient of Component (3) should be present to provide from 0.001 to 0.25 parts, preferably 0.005 to 0.1 part by weight of metal per 100 parts by weight of the polydiorganosiloxane (1).
The compositions of this invention can be prepared by simply mixing Components (1), (2) and (3) in any order.
Usually, however, the most convenient method is to add (2) and (3) to (1).
The compositions comprising (1), (2) and (3) are resistant to degradation under conditions of high shear at elevated temperatures. They are thus particularly useful as viscous coupling fluids, for example in automobile fan clutches, where retention of a stable working viscosity over prolonged periods is required.
1~ The following Example in which all parts are expressed by weight illustrates the invention.
To 89 parts of a trimethylsilyl-end stopped polydi-methylsiloxane having a viscosity of 9 x 10 3 m2/s (9OOOcS) at 25C were added 9.9 parts of a trimethylsilyl-end stopped copolymer of 90% dimethylsiloxane units and 10%
methylphenylsiloxane units having a viscosity of 10 4 m2/s (lOOcS) at 25C. To this mixture was then added, with stirring, 0.5 part of a polydimethylsiloxane having a p-anilinophenoxy group attached to each of its terminal silicon atoms and a molecular weight of approximately 2,000, followed by 0.6 part of zirconium-containing methyl-siloxane containing 3% by weight of zirconium and obtained by heating together a polydimethylsiloxane and zirconium octoate. Stirring was continued until the mixture became homogeneous.
The mixture obtained above exhibited stability of its working viscosity over a long period when employed as a viscous coupling fluid in the fan clutch of a high perfor-mance automobile engine.
~31428~ ~
-Four organosiloxane mixtures A, B, C and D were prepared as described hereinabove containing respectively 0, 0.6, l.0 and 2.0 parts of the zirconium-containing methylsiloxane. Each mixture was then subjected to hermogravimetric analysis employing a Perkin Elmer TCS-2 Thermogravimetric Analyser the temperature being increased at a rate of 30C per minute. For Sample A the onset of rapid weight loss (indicating polymer degradation) commenced at 492~C, total loss of weight of the sample occurring at about 650C. In the cases of Samples, B, C
and D the onset of rapid weight loss did not occur until the temperature had reached approximately 600C and total disappearance of the samples (100% loss of weight) occurred at temperatures from about 700 to 750C.
* Trademark .. ..
Claims (6)
1. An organopolysiloxane composition comprising (1) 100 parts by weight of a liquid polydiorganosiloxane wherein at least 70 percent of the total organic substituents are methyl groups, any remaining organic substituents being selected from alkyl groups having from 2 to 14 inclusive carbon atoms and phenyl groups, (2) from 0.01 to 7.5 parts by weight of an organosiloxane having at least one silicon-bonded group selected from anilinophenoxy and naphthylaminophenoxy groups and (3) a metal compound which is selected from (i) siloxy metal compounds having in the molecule at least one metal atom selected from titanium, zirconium and hafnium atoms attached to silicon via a TiOSi, ZrOSi or HfOSi linkage, and (ii) zirconium salts of monocarboxylic acids, there being sufficient of the metal compound present to provide from 0.001 to 0.25 part by weight of metal.
2. A composition as claimed in Claim 1 wherein the liquid polydiorganosiloxane (1) consists essentially of 70 to 95 parts by weight of a polydimethylsiloxane and 5 to 30 parts by weight of a phenyl-containing siloxane selected from polymethylphenyl-siloxanes and copolymers of dimethylsiloxane and methylphenyl-siloxane.
3. A composition as claimed in Claim 2 wherein the polydi-organosiloxane (1) has a viscosity within the range from 0.001 to 0.05 m2/s.
4. A composition as claimed in Claim 1 wherein the siloxy metal compound is an organosiloxane in which at least 80 percent of the total silicon-bonded organic groups are methyl.
5. A composition as claimed in Claim 1 wherein organosiloxane (2) is present in an amount of from 0.1 to 2.5 parts by weight.
6. An automobile fan clutch which contains as the viscous coupling fluid a composition as claimed in Claim 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB878709745A GB8709745D0 (en) | 1987-04-24 | 1987-04-24 | Liquid organosiloxane compositions |
GB8709745 | 1987-04-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1314280C true CA1314280C (en) | 1993-03-09 |
Family
ID=10616299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000563888A Expired - Fee Related CA1314280C (en) | 1987-04-24 | 1988-04-12 | Liquid organopolysiloxane compositions |
Country Status (7)
Country | Link |
---|---|
US (1) | US4840743A (en) |
JP (1) | JP2595294B2 (en) |
BE (1) | BE1000209A6 (en) |
CA (1) | CA1314280C (en) |
DE (1) | DE3813660C2 (en) |
FR (1) | FR2614308B1 (en) |
GB (2) | GB8709745D0 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2683547B2 (en) * | 1988-09-09 | 1997-12-03 | 東燃株式会社 | Silicone oil composition with excellent heat resistance stability |
JP2671146B2 (en) * | 1989-01-31 | 1997-10-29 | スズキ株式会社 | Idle speed control device |
EP0397507B1 (en) * | 1989-05-10 | 1995-03-15 | Tonen Corporation | Silicone fluids for viscous couplings |
US4898956A (en) * | 1989-06-27 | 1990-02-06 | Dow Corning Corporation | Method to prepare thermo-oxidatively stable phenylmethylsiloxane fluids |
ATE117356T1 (en) * | 1990-06-18 | 1995-02-15 | Tonen Corp | HYDRAULIC, LUBRICANT AND CLUTCH COMPOSITION. |
US5130041A (en) * | 1990-06-21 | 1992-07-14 | Dow Corning Corporation | Silicone fluid compositions having reduced viscosity temperature coefficient |
JPH06158076A (en) * | 1992-11-20 | 1994-06-07 | Cosmo Oil Co Ltd | Fluid composition for viscous coupling |
US5599778A (en) * | 1994-01-28 | 1997-02-04 | Dow Corning Toray Silicone Co., Ltd. | Organosiloxane lubricant compositions |
JPH08143883A (en) * | 1994-11-17 | 1996-06-04 | Dow Corning Asia Ltd | Heat-resistant grease composition |
GB9613756D0 (en) * | 1996-07-01 | 1996-09-04 | Bingley Michael S | Additive composition |
US6623399B2 (en) | 2001-12-28 | 2003-09-23 | Dow Corning Corporation | Traction fluids |
CN113755226B (en) * | 2021-10-21 | 2022-04-29 | 华亿金卫(杭州)能源有限公司 | Oil-soluble organic zirconium friction reducer and preparation method thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3328350A (en) * | 1966-07-05 | 1967-06-27 | Union Carbide Corp | Stabilized organosilicon polymers |
US4193885A (en) * | 1977-08-02 | 1980-03-18 | Dow Corning Corporation | Method for preparing a thermal-stability additive and a thermally stabilized methylpolysiloxane and compositions therefrom |
US4379094A (en) * | 1981-12-30 | 1983-04-05 | Union Carbide Corporation | Ferrosiloxane thermal stabilizers for diorganopolysiloxanes |
JPS60106891A (en) * | 1983-11-14 | 1985-06-12 | Shin Etsu Chem Co Ltd | Hydraulic fluid |
JPS61185597A (en) * | 1985-02-12 | 1986-08-19 | Toray Silicone Co Ltd | Organopolysiloxane composition for viscous fluid joint |
-
1987
- 1987-04-24 GB GB878709745A patent/GB8709745D0/en active Pending
-
1988
- 1988-03-30 GB GB8807574A patent/GB2203750B/en not_active Expired - Lifetime
- 1988-04-07 US US07/179,463 patent/US4840743A/en not_active Expired - Fee Related
- 1988-04-12 CA CA000563888A patent/CA1314280C/en not_active Expired - Fee Related
- 1988-04-13 JP JP63089177A patent/JP2595294B2/en not_active Expired - Lifetime
- 1988-04-20 FR FR8805216A patent/FR2614308B1/en not_active Expired - Lifetime
- 1988-04-20 BE BE8800452A patent/BE1000209A6/en not_active IP Right Cessation
- 1988-04-22 DE DE3813660A patent/DE3813660C2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS63275665A (en) | 1988-11-14 |
GB2203750B (en) | 1991-04-24 |
GB2203750A (en) | 1988-10-26 |
FR2614308B1 (en) | 1992-10-09 |
GB8807574D0 (en) | 1988-05-05 |
JP2595294B2 (en) | 1997-04-02 |
US4840743A (en) | 1989-06-20 |
BE1000209A6 (en) | 1988-08-23 |
DE3813660A1 (en) | 1988-11-17 |
FR2614308A1 (en) | 1988-10-28 |
DE3813660C2 (en) | 1998-09-24 |
GB8709745D0 (en) | 1987-05-28 |
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